Review Chapter 3/ Plasticity– Meyers and Chawla EMA 4223
1. Know relationships between true stress-true strain and engineering (nominal) stress-engineering strain. Be able to interpret stress strain diagrams.
2. Know Holloman relationship and its use: s = s0 + k en.
3. The constant volume assumption for plasticity is important to several derivations:
e1 + e2 + e3 = 0. Know what this means.
4. Considere criterion for necking. [ p. 122]
5. Know general effect of strain rate on yielding: M = (dlns)/ (dln e) & s = K em.
6. Stress-strain relationships in polymers; effect of temperature and strain rate.
7. Know aspects of viscous deformation: t = h [dg/dt] ; h = A exp(Q/RT)
8. Flow, yield and failure criteria: Know basic ideas behind Rankine, Tresca and von Mises criteria.
9. Yield criterion for ductile polymers should be studied. Remember homework problem. [(s1 – s2)2 + [(s2 – s3)2 + [(s3 – s1)2 ] = 6 k2 = constant
10. Hardness – Know at least three hardness techniques, i.e., generally what the hardness techniques measure and the shape of the indenter.
Not responsible for
3.6, 3.6.1, 3.6.2., 3.7.5, 3.9ff.